// Returns the national prefix extracted, or an empty string if it is not present.
private String removeNationalPrefixFromNationalNumber()
{
int startOfNationalNumber = 0;
if (isNanpaNumberWithNationalPrefix())
{
startOfNationalNumber = 1;
prefixBeforeNationalNumber.append('1').append(SEPARATOR_BEFORE_NATIONAL_NUMBER);
isCompleteNumber = true;
}
else if (currentMetadata.hasNationalPrefixForParsing())
{
Pattern nationalPrefixForParsing =
regexCache.getPatternForRegex(currentMetadata.getNationalPrefixForParsing());
Matcher m = nationalPrefixForParsing.matcher(nationalNumber);
// Since some national prefix patterns are entirely optional, check that a national prefix
// could actually be extracted.
if (m.lookingAt() && m.end() > 0)
{
// When the national prefix is detected, we use international formatting rules instead of
// national ones, because national formatting rules could contain local formatting rules
// for numbers entered without area code.
isCompleteNumber = true;
startOfNationalNumber = m.end();
prefixBeforeNationalNumber.append(nationalNumber.substring(0, startOfNationalNumber));
}
}
String nationalPrefix = nationalNumber.substring(0, startOfNationalNumber);
nationalNumber.delete(0, startOfNationalNumber);
return(nationalPrefix);
}
